Piston-turning machine.



A. W. POOTE.

PISTON TURNING MACHINE.

APPLICATION FILED JAN. 9, 191s.

1 095 322. Patented May 5, 1914.

5 SHEETS-SHEET l.

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A. W. F OOTE'. PISTON TURNING MACHINE.

1PPLIGATI0N FILED .TAN.9.1913.

Patented May 5, 1914.

5 SHEETS-SHEET 3.

A. W. FOOTE.

PISTON TURNING MACHINE.

APPLICATION FILED JAN. 9, 1913.

1,095,322. Patented May 5, 1914.

5 SHEETS-SHEET 4.

A. W. FOOTE.

PISTON TURNING MACHINE.

APPLICATION FILED JAN. 9, 1913.

Patented May 5, 1914..

5 SHEETS-SHEET 5.

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ANDREW w. room, or CIJEVELAND, omo.

BISTON-TURNING MACHINE.

7 Specification of Letters latent.

Application filed January 9, 1913. Serial No. 740,970.

To all 'wlzom it may concern:

Be it known that 1, ANDREW Room, a citizen of the United States, and a resident of Cleveland, county of Cuyahoga, and State principle of the invention being herein explained and the best mode in which I have contemplated applying that principle, so as to distinguish it from other inventions.

The subject of the present invention is a machine adapted to operate on piston members turning up the periphery of the pistons and simultaneously smoothing the upper surface of the same. This action is secured by means of atool held in a reciprocating slide and other tools held in a swinging arm, the movement of the two tools being in directions at substantially right angles. A third operation performed is the forming of the grooves in the periphery of the pistons for the packing rings. Means are provided for thus operating the tools in synchronism, suitable driving members being connected to operate both tool bearing parts. \Vhile the tool bearing parts are operated in synchronism, it will be understood that the cutting operations of the various tools need not necessarily occur simultaneously, the exact time of each operation depending upon the adjustment of the tools. 3

The machine has been especially designed to secure the greatest possible simplicity andco-mpactness of construction, and to this end the various units, which will preferably be connected in one machine, are disposed vertically, thus saving considerable floor space, and permitting one operator to conveniently control and oversee the operation of the several units. It is not intended to limit the use of the present machine to the forming of pistons, as it may of course, without material change, be adapted to operate on various materials which must be machined on two transversely disposed surfaces. The number of units which make up each machine is also of little consequence so long as each unit embodies the principlesofconstruction and operation which constitute the vital elements of the invention.

'To the accomplishment of the foregoing and related ends, said invent-ion, then,consists of the means hereinafter fully described, and particularly pointed out in the claims.

The annexed drawings and the following description set forth in detail certain mechanism embodying the invention, such disclosed means constituting, however, but one of various mechanical forms in which the principle of the invent-ion may be used.

In said annexed drawings: Figure 1 is a front elevation of a machine consisting of a pluralityof connected units; Fig. 2 is an end elevation of a single unit; Fig. 3 is a central vertical section through the work spindle taken on the line 33 in F ig.' 2; Fig. 4 is a central vertical section on the line 4-4 in Fig. 1; Fig. 5 is a horizontal section on the line 55 in Fig. 2 Fig. 6 is a vertical section on the line 66 in Fig. 1 showing the automatic drive-releasing mechanism; Fig. 7 is a horizontal sectionon the line 7-7 in Fig. 4;; F ig. 8 is a similar view on the line 8-8 in Fig. 4; Fig. 9 is a horizontal section on the line 99 in Fig. 3; Fig. 10 is a similar section on the line 10-10 in Fig.3; and Fig. 1 1 is a side elevation of a detail of construction.

In Fig. l the general construction of the machine will beseen. While it is immaterial how many units are connected to form the finished machine, I have here shown four such units which are mounted upon a single base or frame 1, such units being spaced from eachother and being totally disconnected except so far as they may be said to be connected by being driven from a single main driving shaft 2. The driving shaft 2 issuitably journaled in the two ends of the frame, being disposed horizontally, and atone end it is provided with pulleys 3 and 1} of different sizes for the purpose of securing drives of various speeds. A bracket 5 attached to the frame serves to support the extending end of the main shaft. which carries such pulleys.

Turning then to the features of the mechanism which constitute the present invent-ion, it will only be necessary to describe in full a single unit, as the units are of course identical in construction and operation. Upon the frame there is mounted a roughly cylindrical casting 6 open at the rear which houses an intermediate driving shaft connected to actuatethe toolarrying members of the device, and is adapted to provide'a support for such tool-carrying members themselves.

A tubular spindle 8 is vertically mounted in the frame in bushings 9 and 10. the first of these 9 being tapered and secured in posi- Patented May 5, 191%..

tion by a nut 11, while the second bushing 10 is held within a tubular extension 12 of the main frame, being secured thereto by any suitable means such as set screws 13. Supported upoif 'the bushing 10 is a ball bearing 140 adapted to receive the vertical thrust of a worm gear 14 keyed to the spindle 8. Below the bearing 10 there is keyed to the spindle a bevel gear 15 held in posi-- tion by nuts 16 and 17 engaging the threaded portion of the spindle. The lower end of the spindle is engaged by an apertured block 18 bearing a plurality of pivoted bell crank clutch arms or jaws 19. These arms are adapted, when moved outward, to con tact and move a disk 20 attached to a clutch rod 21 extending upwardly through the posed about the clutch rod 21 between the disk 20 and a plate 143 attached to the collar 23 and serves to return the rod to its upper or disengaged position. Mounted on the top of the spindle is a chuck plate 30 against which the work 31, shown as a piston casting, is heldby means of a bar 32 entering oppositely disposed apertures in the piston and pivotally engaged by a socket 33 adjustably attached to the clutch rod 21. The action of the clutch brings the work into operative engagement with the chuck plate so that it will be rotated therewith. The precise form of chuck and the operation of the same are of little importance in the present connection as any suitable means may be employed.

Mounted on and attached to the bearing 9 is a flanged bearing 34 formed in coneshape externally, and over this is attached a dust cap 35 attached to the spindle by set screws 36, the cap rotating with the spindle. The introduction into the bearings of dust, dirt and metal shavings is thus absolutely prevented as will be seen, while the parts just described are readily removable when it is necessary to take out the spindle or replace the bushings,

The drive for the spindle is best shown in Figs. 3 and 5, the drive shaft being provided with a worm 40 which is rotatably mounted thereon against a fixed bearing 41, the wormbeing provided with a serrated clutch face 42 adapted to be engaged by a rotatably fixed b-ut slidable complementary clutch member 43 controlled by the usual jaws or fingers 44 which will be operated by means tobc hereinafter described. Ball bearings 145 are disposed at suitable points along the main shaft to reduce to a minimum the friction from the longitudinal thrust caused by the pressure on the worm. The worm when in engagement with the fixed clutch member is adapted to be rotated by the driving shaft and drives the worm gear 14 which is fixedly mounted on the tubular work spindle. In this manner the work is driven from the main driving shaft although it may be at any time thrown out of gear and rendered inoperative by the operation of the clutch members 42. The various other parts of the mechanism are conveniently driven from the spindle, as by this arrangement the disengagement of a single clutch member renders all of the mechanism inoperative.

The bevel gear 15 upon the lower end of the sleeve engages a similar complementary bevel gear 45 fixedly attached to the end of a horizontal shaft 46 provided at its other end with a fixed worm member 47 engaging a gear 48 mounted upon a vertical driving shaft 49 housed at its upper end in the vertical cylindrical casting 6. The gear 48' is rotatable on this vertical shaft and is fixed to the shaft by means of a slidable but rotatably fixed clutch 50 which may, of course, be of anysuitable construction and need not be described in detail, this second clutch being operated by a lever 51 which is attached to the end of an oscillatory shaft 52 extending through the front of the frame where it is attached to a hand lever 53 as shown. The purpose of this clutch mechanism will be hereinafter fully explained.

The vertical shaft 49 extends upwardly through the cylinder and is provided at its upper end with two fixed gears 54 and 55 which are here shown as having different numbers of teeth adapting them to engage two complementary gears 56 and 57 res ectively, attached to a second vertical sha t 58 rotatably mounted in the cylinder. The use of two driving gears having different numbers of teeth provides a steady and accurate drive and reduces to a great extent the wear on the teeth of either gear, thereby preventing any backlash between the teeth, and any inaccuracy in the timing 'of the driven shaft. The second'vertical shaft is rotatably mounted in the cylinder as before mentioned, being housed-in suitable bearings 60 and 61, ball bearings 150 and 151 being also provided. The lower portion of the shaft is threaded adapting it,to adjustably engage a cylindrical cam 63 which may be attached to the shaft by keys 64 when it is adjusted to the proper position. Upon the outer face of the cylinder there is engaged'and reciprocably mounted upon machined guides 104 a tool slide 7 0 which is adapted to be reciprocated in a vertical direction bymeans of the cylindrical cam already referred to. A vertical slot 71 is provided in the face of the cylinder through which extends a bearing pin 72 attached to the tool slide and engaged in the slot 7 3 in the cam. The slot in the cam is formed as shown in Fig. 4 and the operation by which the tool slide will be reciprocated will be readily understood from this figure. It will be seen that one complete revolution of the vertical shaft 58 gives to thetool slide a downward and a return movement, the operation of the tool slide being absolutely and positively controlled by the cylindrical cam, and being made to perform a complete cycle of movement for each complete revolution of the cam. A counterweight 160 for the tool slide is provided and is connected thereto by a cable 161 operating over two grooved pulleys 162 mounted on the side of th' cylin drical casting. The cable is attached to the slide by means of a threaded pin 163 engaged therein and Operating in a slot 164k in the outer face of the cylinder, and to the weight by means of a hook 165.

On the'vertical shaft 58, adjacent to the upper end of the same there is keyed a plate cam 7 5. In. suitable brackets 76 extending laterally from the cylinder there is mount-' ed a vertical oscillatory shaft 77 provided at its upper end with a contact arm 7 8 havingfixed at its upper end a flanged stud 79 adapted to be contacted and operated by the plate earn 0 nthe vertical shaft 58. The oscillatory shaft is provided at its lower end with-a second or tool-bearing arm 80 adapted to receive a suitable cutting tool 81. The tool 81 is adapted to operate on a Vertical surface upon the inward swinging of the arm 80. In the tool bearing arm 80 there are also mounted a plurality of tools 168 ada ted at a certain point in the movement of t e arm to operate laterally on the work. These are so positioned, however, that they do not operate until after the surfacing of the sides of the work by the tool carried by the slide, being adapted to cut the recesses in the pistons which are to receive the packing rings. The construction of the plate cam is best shown in Fig. 8, and it will be seen that when the'vertical shaft 58 is rotating in a clockwise direction (from the viewpoint taken in Figs. 7 and 8) the tool arm will be swung inwardly or in a clockwise direction toward the work spindle through the major portion of the revolution at a very slow speed, and at a certain point in the revolution the highest point of the cam will pass the stud 79 on the arm. Suitable resilient means, here shown as a coiled spring SEE-suitably attached to the cylinder and tothe bearing arm are provided for rapidly returning the oscillatoryshaft to its normal position at this point in the revolution of the shaft 58.

Upon the upper end of the shaft 58 there is fixed a bevel gear 90 engaged by a second bevel gear 91 attached to a short horizontal shaft 92 extending through, and borne by, a short projection 98 on the top of the cylindrical casting, the shaft terminating in a square head 94 as shown in Fig. 4. The use of these means is extremely convenient When, through some accident or flaw in the casting, the material being operated upon is broken, in which case it is undesirable, and even unsafe to the machine, to permit the work to be further operated upon, as it is possible that some of the mechanism or tools will be broken or damaged by the operation upon a broken casting. Should, therefore, a piece of material become broken, it is only necessary to stop the machine by turning the handlever 53 which operates the second clutch 50 controlling the driving engagement of the gear at the lower end of the vertical driving shaft 49. When this lever is thrown the gear is disengaged from the shaft and further movement of both of the tool bearing members is at once stopped. It is then possible. to unclamp" the material from the work spindle by rotating the handies 29, although it will be seen that this operation is not necessary to the returning of the tool members to the starting position, and by rotating the short shaft 92 mounted in the head of the cylinder the two cams may be returned to their normal or starting position regardless of the point of operation which they had attained at the time of the breakage. This mechanism is extremely important in machines of the present type where a number of units are connected to be driven by a single shaft, as should a break occur in one of the castings it is not economical to stop the entire machine while the broken part is being removed. With the mechanism just described it is possible to remove a single casting and yet not interfere with the operation of the other units of the machine.

The tool slide and the tool arm are best shown in Figs. 1, 2 and 4:. The tool slide is provided at its lower portion with a pivotally mounted tool bearing arm or lever 96, and a spring 97 is interposed between the slide and one end of this arm for the purpose of normally retaining the tool-holding part 98 of the arm in contact with the face of the slide. The usual means may be provided for adjusting and attaching the cutting tool 99 to the tool arm, and such means form of course no part of the present invention and hence need not be described in detail. It is only necessary to say that the tool is held horizontally in the tool arm and is adapted to operate upon a vertical surface as the slide is reciprocated. A rod 100 is borne vertically on the face of the tool slide and between the outer face of the slide and th tool arm, the slide being apertured at the projections 10? and 108 to receive the rod. With the faces of the arm and slide in contact the cutting tool will be in position to operate upon the material on the spindle. The. rod is provided at its lower end with a recessed portion 101, the recess terminating at its lower end in a beveled face 102 which is adapted, upon relative movement of the rod and arm, to engage against the lower edge of the tool arm, thus slightly oscillating the arm and swinging the cutting tool out of engagement with the work. At the lowest point of the downward movement of the slide, the rod, which is of course in its normal or lowest. position, where it is held by a disk 103 attached to it and in contact with the top of one of the machined guides 10-1 on which the slide moves, is engaged at its tapered or beveled portion 102 by the tool arm, thus forcing the tool outwardly from the slide and disengaging the tool from the work. The action of the beveled face on the rod is to wedge itself tightly between the tool arm and the slide, thus retaining the rod in this position during the upward movement of the slide and preventing any ngagement or even contact between the cutting tool and the work. When the slide reaches its upper position the upper end of the rod engages the projection 105 at the upper end of the cylinder and forces the rod to its lower position, at which time the spring 97 will return the tool arm into contact with the slide, thus preparing the tool for the downward movement of the slide by placing it in its operative position. The importance of these means will of course be seen, as it is necessary that the machined face of the work is not marred or scratched by the action of the cutting tool during the return movement-"of the slide.

it is desirable to provide means which will automatically operate to release the drive from the cam shaft 58 upon the completi n of each cycle, in order that new material may be inserted before the next operation of the tool bearing arm and slide. The mechanism which 1 have designed for this purpose is entirely automatic in character, it being only necessary to manually set the means upon the-beginning of each new cycle. Extending upwardly from theframe is a bracket 110 adapted to suitably journal a short horizontal shaft 111 mounted parallel with the face of the tool slide and hearing at its right end a rectangular portion 112 which is adapted to be received in a knock-ofi' memher or lever 113 which is provided with a longitudinal and substantially rectangular slot 114 in which is carried a coil spring 116 adapted to normally retain the knock-oil" member with its engaging end 117 at the maximum possible distance from the horizontal shaft 111. In other words, the knockoff member is normally retained in such a roeaaae position that it will be engaged by a suitable contacting face or lug 118 carried by the tool slide. A pin 115 fixed in'the engaging end 117 of the lever 113 is provided to be contacted by the lug 118 on the tool slide. At the other end of the shaft there is attached a disk 120 upon which there is eccentrically mounted a rod 121 extending downwardly therefrom, such rod being provided with an indentation forming a contacting face 122 which is adapted to receive apin 123 mounted at a suitable point upon the face of the disk. The rod is pivotally attached at its lower end to a lever 12d pivotally attached to a pin 166 mounted on the bracket 110, the lever being pivotally attached at its outer end to a link 125 having its lower end formed into a yoke 126 which engages a horizontally disposed arm 127 connecting with and operating a shaft 128 which bears the clutch member is controlling the engagement of the main driving worm 4-0 to the shaft 2.

The knock-off lever has a handle 129 formed on its outer end, its inner end being rounded, the lever resting normally in the position shown in Fig. 6. The contacting lug 118 attached to the lower part of the tool slide is adapted, upon downward movement of the latter, to strike against the round pin of the extending end of the knock-off lever. Should the knockpfi lever not be in the position shown in Fig. 6, that is, should it be slightly nearer the horizontal, the action of the lug will force the lever into position of Fig. 6, at which time the pin 123 on the disk will have been rotated through a portion of a circle, caused of course by a rotation of the horizontal shaft, the pin then engaging the recessed face 122 in the lever which prevents further rotation of the disk except after shearing of the pin or breaking of some of the other parts of the mechanism. The pressure of the lug 118 against the rounded surface of the pin 115 will cause pressure on the lever in a horizontal direction and also in a vertical direction. The vertical pressure is of course resisted by the action of the pin in .the recess so that the horizontal pressure will tend to force the lever longitudinally away from the contacting lug as the spring 116 exerts a'less pressure than that component of the horizontal pressure on the lever which acts in a direction alined with the center line of the knock-ofi' lever. It

will be understood then that downward movement of the slide causes merely a sliding of the knock-0d lever without operatively rotating the horizontal shaft to operate the main clutch. Upward movement of the tool slide, however, causes the lug to again engage the knock-0d lever but the pressure in this case causes a rotation or swinging of the horizontal shaft which,

- through the links which have been described in the preceding paragraphs, will actuate the main clutch to disengage the main driving worm from the driving shaft. The lug will be so disposed upon the tool slide relatively to the position of the knock-off lever that the disengagement of the main clutch will occur at the'highest point of movement of the tool slide, that is, at the exact'point of the completion of the cycle of operations. Before starting the mechanism again the knock-off lever must be manually returned to its normal position (see Fig. 6) which may be done by pulling the lever away from the tool slide until the rounded end will pass the lug and then rotating to the desired position, which engages the main driving clutch members 12 and 43.

Certaindetails of construction have not been described at length for the reason that in the majority of these cases any suitable and well known means may be provided for carrying out the operation of the parts described. An example of this is the plate 180 which is provided with two downwardly extending, tubular portions 181 and 182, in

each of which there is provided a bushing, these bushings 60 and 184 being adapted to respectively journal the shafts 58 and 49, the plate itself resting upon a partition 185 in the upper portion of the cylinder. Similarly the particular form of the frame is of little importance in the present connection provided it is adapted to support-and properly carry the various operating parts of the mechanism.

The various units which make up an assembled machine may be operated either together or singly, and it is not necessary that the operation of each unit correspond in time to that of any other unit. In fact preferably the reverse will be true in order that one operator may properly and conveniently control the various units. When the main driving shaft is rotating, and it is desired to turn up a piston, the piston is placed upon the chuck plate 30, the piston seating in the circular recess 186 in the plate and being held thereon by the means described and shown in Fig. 3. After the pis, ton member has been properly placed on the chuck plate, it may be locked to rotate with the spindle by turning the handles 29.

'It will be assumed that the two tool hear- .ing members, the slide and the swinging arm, are at their starting or inoperative position at this time. It is then necessary to rotate the knock-off lever 113 into the position shown in Fig. 6. This operation engages the clutch 43 with the clutch member 42 attached to the main driving worm 40, thus causing rotation of the spindle through the gear 14 and consequently rotation of the piston member which is carried on the chuck plate, The rotation of the spindle rotates the short horizontal shaft 46 through the bevel gears 14 and 15 and the rotation of this shaft operates the shaft 49. through the gear 48 and worm 47, it being assumed that the clutch 50 is in position to lock the gear 48 to the shaft 49. Rotation of the shaft 19 drives the cam shaft 58 through the gears 54, 55, 5b and 57, thus rotating the cylindrical cam 63 and the plate cam 75. As will be seen from the conformation of the cam members, the cylindrical cam will at once begin to move the tool slide downwardly, and if the tool 99 is properly adjusted it will at once begin to machine the side of the rotating piston, it being fed downwardly continuously through this operation. The plate cam develops very slowly during the first quarter of its revolution, and it will therefore be seen that the tool arm 80 and the tool 81 are not moved into a position where the latter will engage the top of the piston until the tool slide has i moved down a considerable distance. At this. point, however, the tool 81 will engage the top of the piston and will be fed across to the center of the piston. When the latter point is reached, the highest point of the cam engages the stud 79 and the release of theaoscillatory shaft 77 follows, thus rapidly swinging the tool 81 from out of engagement with the top of the piston member by means of the spring 83.

The tools 168 which are similar in construction, but are spaced a certain distance from each other, engage the piston after the tool 99 has machined the upper half of the surface of the piston, the tools 168 then cutting recesses or grooves in the wall of the piston for the purpose of receiving the packcal cam and the plate cam are so constructed and timed that the tool 99 and the tool slide will have reached their lowest position at the same time that the tool 81 reaches the center of the upper surface of the piston, and the tools 168 reach the desired depth of groove in the wall of the piston. At this point the rod 100 swings the tool bearing arm 98 into a-position which removes the tool 99 from engagement with the wall of the piston. The tool carrying arm 80 is simultaneously swung away from the piston, and the tools 81 and-168 are therefore both removed fromengagement with the piston. During the return movement of the tool slide the arm 78 is' gradually returned toward the tool, as will be readily seen from an inspection of the plate cam 75, but the tool 81 will not be brought into close proximity with the piston until the. tool slide has reached the limit of its upward movement, or in other words until a cycle of operations has been completed. As the tool slide reaches its upper position the lug 118 opmg rings to be applied later. The cylindri-- 'er'ates the knock-off lever 113 which disen 3p gages the main driving clutch 43 from the clutch on the worm 40.. The unit is therefore at this time inoperative, and the piston may be removed from the spindle by releasing the chuck by rotating the handles 29, and a new piston inserted when the operation will be repeated.

It is unnecessary to describe the action in case a piston is broken during the operation, as that has been already described. In such an event the lever 53 is rotated, which disengages the driving connection between the shaft 49 and the gear 48, thus stopping the further operation of the two cams and consequently of the tool bearing members. The

lattermay be returned to their initial posi-' tions by operating the short horizontal shaft 92 in themanner previously indicated.

The important features of the invention are the construction of piston turning machines which may be connected to be driven from a single driving shaft, the single units being formed vertically, thus afiording an extremely compact construction. A further part of the invention is a synchronized and cooperative movement of a plurality of separately carried tool members driven from a single driving shaft through any suitable means, which are here shown as cams. The advantage of providing an automatic drive releasing mechanism, which may be returned to its engaging position by a single manual movement will be readily seen, as will the advantage of having means for manually releasing the drive in case of breakage of the work or failure of any of the parts of the machine. I

Other modes of applying the principle of my invention may be employed instead of the one explained, change being made as re gards the mechanism herein disclosed, provided the means stated by any of the following claims or the equivalent of such stated means be employed.

It therefore particularly point out and distinctly claim as my invention 1. In mechanism of the character de scribed, the combination of a vertically disposed work spindle; a vertically movable tool slide; a vertically disposed rotatable shaft; an oscillatory vertical shaft; a tool arm attached to-said oscillatory shaft; a second arm attached thereto; a cylindrical cam operatively mounted on said rotatable shaft and adapted to reciprocate said tool slide; a plate cam operatively mounted on said rotatable shaft and adapted to actuate said second arm on said oscillatory shaft, thereby oscillating thelatter in one direction, said two cams being formed to synchronously move said tool slide in one direction and to swing said tool arm; a coiled spring attached to said arm and adapted to return said tool arm to normal position before the return of movement of said tool slide; a tool .scribed, the combination of a verticall roeasea carrier pivotally mounted on said slide about a vertical axis; resilient means normally retaining said carrier in its work engaging position; and means operableupon movement of said slide and adapted to swing said carrier out of engagement with the work during the return movement of said slide.

2. In mechanism of the character described, the combination of a vertically disposed work spindle; a vertically movable tool slide; a. vertically disposed rotatable shaft; an oscillatory vertical shaft; a tool arm attached to said oscillatory shaft; a second arm attached thereto; a cylindrical cam operatively mounted on said rotatable shaft and adapted to reciprocate said tool slide; a plate cam operatively mounted on said rotatable shaft and adapted to actuate said second arm on said oscillatory shaft, thereby oscillating the latter in one direction, said two cams being formed to synchronously move said tool slide in one direction and to swing said. tool arm; a coiled spring attached to said arm and adapted to return said tool arm to normal position before the return movement of said tool slide; a tool carrier pivotally mounted on said slide about a vertical axis; a rod slidably mounted in said tool slide and being provided with a tapered portion adapted to engage and to swing said carrier out of engagement with the work; and a stop adapted to be contacted by said rod upon movement of said slide, whereby the movement of said slide brings such tapered portion of said rod into engagement with said carrier, thereby swinging the same out of engagement with the work.

3. In mechanism of the character dedisposed work spindle; a vertically movab e tool slide; a vertically disposed rotatable shaft; an oscillatory vertical shaft; a tool arm attached to said oscillatory shaft; a second arm attached thereto; a cylindrical cam operatively mounted on said rotatable shaft tit) int

and adapted to reciprocate said tool slide;

a plate cam operatively mounted on said rotatable shaft and adapted to actuate said second arm on said oscillatory shaft, thereby oscillating the latter in one direction, said two cams being formed to synchronously move said tool slide in one direction and to swing said tool arm; a coiled spring attached to said arm and adapted to return said tool arm to normal position before the return movement of said tool slide; a tool carrier pivotally mounted on said slide about a vertical axis; a rod slidably mounted in said tool slide and being provided with a tapered portion adapted to engage and to swing said carrier out of engagement with the work; and two spaced stops adapted to be contacted by said rod upon movement of said slide, whereby one movement of said slide brings lit liltl permitting the latter to return to its work engaging position.

4. In mechanism ,of the character described, the combination of a main driving shaft; a worm rotatably mounted thereon; means adapted to connect said worm to said shaft to be driven. thereby; a work spindle adapted to be driven by said worm; a reciprocably mounted tool slide; means driven from said spindle and adapted to reciprocate said slide; a contactingface formed on said slide; a pivotally mounted lever adapted to be engaged and actuated'by said contacting face upon the completion of a cycle by said slide; and means operated by said lever, said means being connected to said first-named means for connecting said" worm to said shaft, whereby the latter is disengaged, stoppingthe operation of said mechanism.

5. In mechanism of the character described, the combination of a main driving v shaft; a worm rotatably mounted thereon; a clutch adapted when operated to operatively connect-said worm to said shaft; a work spindle adapted to be driven by said worm; a vertically reciprocable tool slide; means driven by said spindle and adapted to reciprocate said slide; a laterally extending lug attached to said 'tool slide; a horizontal shaft mounted parallel with said slide; a lever fixed to rotate with said shaft, said lever being transversely slidable on said shaft; means connecting said horizontal "shaft and said clutch, whereby operation of said lever causes disengagement of said clutch, said lever extending into the path of movement of said lug at an angle to the H same when said clutch is engaged; and means restraining rotation of said lever when contacted by said lug upon downward movement of said tool slide, whereby said lever slides transversely of said shaft.

6. In mechanism of the character described, the combination of a main driving shaft; a worm rotatably mounted thereon; a clutch adapted when operated to operatively connect said worm to said shaft; a work spindle adapted to be driven by said worm; a vertically reciprocable tool slide; means driven by said spindle and adapted to reciprocate 'said slide; a laterally extending lug attached to said tool slide; a horizontal shaft mounted parallel with said slide; a lever fixed to rotate with said shaft, said lever being transversely slidable on said shaft; means connecting said horizontal shaft and said clutch, whereby operation of said lever causes disengagement of said clutch, saidilever extending into the path of movement of said lug at an angle to the same when saidclutch is engaged; a disk attached to said horizontal shaft; avlink pivotally attached eccentrically to said disk, said lever being providedwith a transversely disposed contacting face; a pin mounted on said disk and adapted to be moved into engagement with such contacting face upon contact of said lug with said lever upon downward movement of said slide, thereby restraining rotation of said horizontal shaft and causing said lever to slide from beneath said lug, the latter being adapted to rotate said lever, thereby disengaging said clutch, upon upward movement of said slide.

Signed by me, this 7th dayof January,

,- ANDREW W. FOOTE.

Attested by-- r HORACE. B. FAY,

- D. T. DAVIES. 

